Hello all, I am purchasing my first Baer and on some of the guns I see that they have "NM Steel" Slides and Frames but on others it just just it has "NM" Slides and Frames. I dont know what "NM" means. It is relevant because I want Steel, not aluminum!!! Does the Premier II Super Tac have a "Steel" slide and Frame. I know Aluminum Frames make the guns lighter for carry but if I am spending over 2K, I just prefer steel. Thanks in advance.